Study on rheologic properties of attapulgite suspensions

The influence of content of dispersant polyacrylic ammonium NH_4PAA and ionic strength on rheologic properties of attapulgite suspensions was studied. The results showed that the rheologic properties could be improved by using NH_4PAA as dispersant in attapulgite suspensions. When pH was 8.5, the content of dispersant NH_4PAA 4.5%, attapulgite suspensions with good dispersion could be prepared. If pH was increased, the optimum content of dispersant would be decreased. The rheologic properties of attapulgite suspensions would be decreased by using NaCl as electrolyte. When the concentration of NaCl changed to 1.0 mol/L from 0.5 mol/L, the rheologic properties of attapulgite suspensions was basically constant.